Finding the Fourth Proportional to 21,868.36, 30,180.88 and 12,438.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,868.36 : 30,180.88 = 12,438.32 : x
2. Step 2: Convert to fraction form
   21,868.36/30,180.88 = 12,438.32/x
3. Step 3: Cross multiply
   21,868.36x = 30,180.88 × 12,438.32
4. Step 4: Simplify right side
   21,868.36x = 375,399,443.32
5. Step 5: Solve for x
   x = 375,399,443.32/21,868.36
6. Step 6: Final answer
   x = 17,166.33